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Naphthalene
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<p>Naphthalene is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with formula <a href="/facts/Carbon/ukrgQexo">C</a>10<a href="/facts/Hydrogen/BoYHjl0J">H</a>8. It is the simplest <a href="/facts/Polycyclic_aromatic_hydrocarbon/K52xSfNC">polycyclic aromatic hydrocarbon</a>, and is a white <a href="/facts/Crystal/e2R2mk3E">crystalline solid</a> with a characteristic odor that is detectable at concentrations as low as 0.08 <a href="/facts/Parts-per_notation/PozRuoLM">ppm by mass</a>. As an <a href="/facts/Aromaticity/wK0DzRY6">aromatic</a> hydrocarbon, naphthalene's structure consists of a fused pair of <a href="/facts/Benzene/Fguue7nr">benzene</a> rings. It is the main ingredient of traditional <a href="/facts/Mothball/sbepfL5r">mothballs</a>. </p>